Instruction Sheet
5120 Mixing Valve
102-413
SUPERSEDES: New EFFECTIVE: June 1, 2010
Plant I.D. 001-3948
GENERAL:
• All installations should be carried out by a Licensed
Professional.
• Ensure compatibility of valve installation, e.g. tempera-
ture of hot water, inlet pressure, and flow rates - refer to
specification section.
• Install in accordance with markings on valve body, i.e.
hot water inlet - marked “H”, cold water inlet - marked
“C” and mixed outlet - marked with directional arrow.
• Valve may be installed in any position.
• Any inconsistency between these instructions and any
specific instructions, bylaws or codes issued by local
authorities must be referred back to Taco, Inc. prior to
any installation taking place.
• The Taco Series 5120 Mixing Valve must not be fitted on
steam supplied systems.
• During startup ensure that the valve is set to the desired
temperature (valve preset to 120°F (49°C) with 150°F
(66°C) hot water inlet temperature). If the valve tempera-
ture needs to be adjusted please refer to the instructions
below (SETTING VALVE OUTLET TEMPERATURE).
FITTING VALVE TO PIPEWORK:
• Flush all piping thoroughly before installing the valve
(using water only).
• Valve comes complete with union type connections for
ease of installation and service.
• Valve must be removed from the piping prior to soldering
the end connections. It is recommended to use a spacer
piece while soldering.
SETTING VALVE OUTLET TEMPERATURE:
The Taco Series 5120 Mixing Valve is supplied factory set
to 120°F with 150°F hot water inlet temperature. It may
need to be altered depending on operating requirements.
1. Remove the green cap by inserting a small screwdriver
in the notch and gently prying up. (See Figure 1.)
2. Turn both the hot and cold water supplies on. Open an
outlet, preferably a sink or basin rather than a shower. To
calibrate, let the water run for 2 minutes and measure
the outlet temperature with a thermometer. Using the
adjustment tool provided to fit over the spindle end,
adjust the spindle counter clockwise to increase tem-
perature and clockwise to decrease temperature. (See
Figure 2.)
3. Once the desired outlet temperature has been achieved
replace the cap over the spindle and snap it onto the
body.
Figure 1
Figure 2
HOT
COLD
COLD
MIX
COLD WATER LOOP
FLOW REGULATOR
12" RECOMMENDED
HOT
TYPICAL DOMESTIC WATER INSTALLATION:
COMFORT MADE EASY
®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.
TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Copyright 2010
TACO, Inc.
CAUTION: The Taco Series 5120 Mixing Valve is certi-
fied to ASSE 1017-2009. It is not to be used to provide
“anti-chill” or “anti-scald” service. Taco Mixing Valves
are not designed to compensate for system pressure
fluctuations and should not be used where more
sophisticated pressure compensating temperature
controls are required.
SPECIFICATION:
Hot Water Inlet Temperature: 140 - 210°F (60 - 100°C)
Cold Water Inlet Temperature: 39 - 80°F (4 - 27°C)
Maximum Working Pressure: 200 psi
Minimum Flow Rate: 1 GPM
Outlet Water Temperature Range: 95 - 131°F (35 - 55°C)
Minimum Temperature Differential
(between hot supply and outlet): 27°F (15°C)
Allowable Supply Pressure Variation: ±10%
The Taco Series 5120 Mixing Valve maintains a constant
outlet temperature to ±5°F given limited variations of water
inlet temperature and pressures. Note: At low flow opera-
tion, the outlet temperature may vary slightly more.
Differential pressure at the valve inlets should be within a
2 to 1 ratio under normal flow conditions. Inline fittings,
piping layout and sizing must be taken into consideration.
In applications where hot water thermal siphoning is a
concern, the valve should be “trapped”, installing the valve
below the cold water inlet to the heater.
MAINTENANCE:
The Taco Series 5120 Mixing Valve does not require rou-
tine maintenance but should be checked annually.
Replacement element assemblies are available.
O-RING/PISTON SUBASSEMBLY REPLACEMENT:
1. Isolate the valve from the water supply.
2. Unscrew the union nuts and remove the valve body
from the system.
3. Using a screw driver, pry the cover from the valve.
4. Secure the valve body (using the flats on the body) and
unscrew the brass cap to remove the internals of the
valve.
5. Remove the piston assembly out of the top of the
valve. If necessary, push the piston assembly from the
outlet port of the valve.
6. Using a clean cloth gently wipe out the valve body
paying particular attention to the o-ring half way down
the inside of the valve body.
7. Remove the o-ring from the cap. Lightly grease the new
cap o-ring and re-grease the o-ring half way down the
inside of the valve with the grease packet provided.
8. Assemble in the reverse order.
9. When re-fitting the brass cap do not over tighten, as
this is an o-ring seal.
10. Reinstall the valve into the piping arrangement using
the union fittings and set the outlet mix temperature as
indicated above (SETTING VALVE OUTLET TEMPER-
ATURE).
Taco, Inc. will repair or replace without charge
(at the company’s option) any product or part
which is proven defective under normal use
within one (1) year from the date of start-up or
one (1) year and six (6) months from date of
shipment (whichever occurs first).
In order to obtain service under this warranty, it
is the responsibility of the purchaser to prompt-
ly notify the local Taco stocking distributor or
Taco in writing and promptly deliver the subject
product or part, delivery prepaid, to the stocking
distributor. For assistance on warranty returns,
the purchaser may either contact the local Taco
stocking distributor or Taco. If the subject prod-
uct or part contains no defect as covered in this
warranty, the purchaser will be billed for parts
and labor charges in effect at time of factory
examination and repair.
Any Taco product or part not installed or operat-
ed in conformity with Taco instructions or which
has been subject to misuse, misapplication, the
addition of petroleum-based fluids or certain
chemical additives to the systems, or other
abuse, will not be covered by this warranty.
If in doubt as to whether a particular substance
is suitable for use with a Taco product or part, or
for any application restrictions, consult the
applicable Taco instruction sheets or contact
Taco at [401-942-8000].
Taco reserves the right to provide replacement
products and parts which are substantially similar
in design and functionally equivalent to the
defective product or part. Taco reserves the right
to make changes in details of design, construc-
tion, or arrangement of materials of its products
without notification.
TACO OFFERS THIS WARRANTY IN LIEU OF
ALL OTHER EXPRESS WARRANTIES. ANY
WARRANTY IMPLIED BY LAW INCLUDING
WARRANTIES OF MERCHANTABILITY OR
FITNESS IS IN EFFECT ONLY FOR THE DURA-
TION OF THE EXPRESS WARRANTY SET
FORTH IN THE FIRST PARAGRAPH ABOVE.
THE ABOVE WARRANTIES ARE IN LIEU OF
ALL OTHER WARRANTIES, EXPRESS OR
STATUTORY, OR ANY OTHER WARRANTY
OBLIGATION ON THE PART OF TACO.
TACO WILL NOT BE LIABLE FOR ANY SPE-
CIAL, INCIDENTAL, INDIRECT OR CONSE-
QUENTIAL DAMAGES RESULTING FROM THE
USE OF ITS PRODUCTS OR ANY INCIDENTAL
COSTS OF REMOVING OR REPLACING
DEFECTIVE PRODUCTS.
This warranty gives the purchaser specific
rights, and the purchaser may have other rights
which vary from state to state. Some states do
not allow limitations on how long an implied
warranty lasts or on the exclusion of incidental
or consequential damages, so these limitations
or exclusions may not apply to you.
LIMITED WARRANTY STATEMENT
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